This is not your standard 90° Elbow. This is called a ‘Street’ Elbow and is 1 inch male spigot x female Socket (Slip). The spigot will connect to another fitting.
Fits inside the 1″ pipe on one side, and over the 1″ pipe on the other side.
Schedule 40 fittings have thinner walls and are not recommended for high-pressure applications.